diff --git a/lldb/scripts/framework-header-fix.py b/lldb/scripts/framework-header-fix.py
index aa034db36968..36c5c67c59d3 100755
--- a/lldb/scripts/framework-header-fix.py
+++ b/lldb/scripts/framework-header-fix.py
@@ -112,7 +112,7 @@ def main():
     # but passing them in with dashes for this script causes argparse to think that they're
     # arguments in and of themself, so they need to passed in without dashes.
     if args.unifdef_guards:
-        unifdef_guards = ["-" + guard for guard in args.unifdef_guards]
+        unifdef_guards = ["-U" + guard for guard in args.unifdef_guards]
 
     # Create the framework's header dir if it doesn't already exist
     if not os.path.exists(os.path.dirname(output_file_path)):
diff --git a/lldb/test/Shell/Scripts/TestFrameworkFixScript.test b/lldb/test/Shell/Scripts/TestFrameworkFixScript.test
index 2b1818ef8d6c..183ea3a80fe5 100644
--- a/lldb/test/Shell/Scripts/TestFrameworkFixScript.test
+++ b/lldb/test/Shell/Scripts/TestFrameworkFixScript.test
@@ -1,6 +1,6 @@
 # Create a temp dir for output and run the framework fix script on the truncated version of SBAddress.h in the inputs dir.
 RUN: mkdir -p %t/Outputs
-RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_main -i %p/Inputs/Main/SBAddress.h -o %t/Outputs/SBAddress.h -p /usr/bin/unifdef --unifdef_guards USWIG
+RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_main -i %p/Inputs/Main/SBAddress.h -o %t/Outputs/SBAddress.h -p /usr/bin/unifdef --unifdef_guards SWIG
 
 # Check the output
 RUN: cat %t/Outputs/SBAddress.h | FileCheck %s
diff --git a/lldb/test/Shell/Scripts/TestFrameworkFixUnifdef.test b/lldb/test/Shell/Scripts/TestFrameworkFixUnifdef.test
index ba18b4b41d3a..a4fffe4ed79a 100644
--- a/lldb/test/Shell/Scripts/TestFrameworkFixUnifdef.test
+++ b/lldb/test/Shell/Scripts/TestFrameworkFixUnifdef.test
@@ -1,7 +1,7 @@
 # REQUIRES: system-darwin
 # Create a temp dir for output and run the framework fix script on the truncated version of SBAddress.h in the inputs dir.
 RUN: mkdir -p %t/Outputs
-RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_main -i %p/Inputs/Main/SBAddress.h -o %t/Outputs/SBAddress.h -p /usr/bin/unifdef --unifdef_guards USWIG
+RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_main -i %p/Inputs/Main/SBAddress.h -o %t/Outputs/SBAddress.h -p /usr/bin/unifdef --unifdef_guards SWIG
 
 # Check the output
 RUN: cat %t/Outputs/SBAddress.h | FileCheck %s
diff --git a/lldb/test/Shell/Scripts/TestRPCFrameworkFixScript.test b/lldb/test/Shell/Scripts/TestRPCFrameworkFixScript.test
index e2080ca01a6f..d7775c20bc44 100644
--- a/lldb/test/Shell/Scripts/TestRPCFrameworkFixScript.test
+++ b/lldb/test/Shell/Scripts/TestRPCFrameworkFixScript.test
@@ -1,6 +1,6 @@
 # Create a temp dir for output and run the framework fix script on the truncated version of SBAddress.h in the inputs dir.
 RUN: mkdir -p %t/Outputs
-RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_rpc -i %p/Inputs/RPC/RPCSBAddress.h -o %t/Outputs/RPCSBAddress.h -p /usr/bin/unifdef --unifdef_guards USWIG
+RUN: %python %p/../../../scripts/framework-header-fix.py -f lldb_rpc -i %p/Inputs/RPC/RPCSBAddress.h -o %t/Outputs/RPCSBAddress.h -p /usr/bin/unifdef --unifdef_guards SWIG
 
 # Check the output
 RUN: cat %t/Outputs/RPCSBAddress.h | FileCheck %s
diff --git a/lldb/tools/lldb-rpc/LLDBRPCHeaders.cmake b/lldb/tools/lldb-rpc/LLDBRPCHeaders.cmake
index 6c363f411511..2376e234cd83 100644
--- a/lldb/tools/lldb-rpc/LLDBRPCHeaders.cmake
+++ b/lldb/tools/lldb-rpc/LLDBRPCHeaders.cmake
@@ -79,7 +79,7 @@ function(FixIncludePaths in subfolder out)
 
   add_custom_command(OUTPUT ${parked_header}
     COMMAND ${LLDB_SOURCE_DIR}/scripts/framework-header-fix.py
-            -f lldb_rpc -i ${in} -o ${parked_header} -p ${unifdef_EXECUTABLE} --unifdef_guards USWIG
+            -f lldb_rpc -i ${in} -o ${parked_header} -p ${unifdef_EXECUTABLE} --unifdef_guards SWIG
     DEPENDS ${in}
     COMMENT "Fixing includes in ${in}"
   )